A bag contains 35 balls numbered from 1 to 35. One ball is drawn at random. Find the probability that a drawn ball is a multiple of 5 or 7. And 3 or 7
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Lets consider this question =>
A bag contains 50 balls numbered from 1 to 50. One ball is drawn at random. Find the probability that a drawn ball is a multiple of 5 or 7.
ANSWER =>
probability that ball is multiple of 5 = 5,10,15,20,25,30,35,40,45,50 = 10
probability that ball is multiple of 7 = 7,14,21,28,35,42,49 = 7
probability that ball is multiple of both 5 and 7 i.e. 35 = 1
therefore
ans. = 16.
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